Posted by **mysterychicken** on Tuesday, May 26, 2009 at 11:29am.

Can someone help me with this one-

Quadrilaterals are a special type of polygon because _______________.

A. they always have exactly four sides

B. the sum of their interior angles always measures 180°

C. they always have opposite sides that are parallel

D. they are always concave

Thanks

-MC

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